Because telescopes are so sensitive that the reflections of a bright satellite inside the optics bascially ruin all pixels in the frame. And there is so many sa

Because telescopes are so sensitive that the reflections of a bright satellite inside the optics bascially ruin all pixels in the frame. And there is so many satellite that all frames close to dusk/dawn are impacted. So you loose 1/3 of your observing time. And all of the time in which you are geometrically most likely to find object on orbits that intersect the Earth orbit.